MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

DiscoveryServer directory

Remote MCP servers

Find a server for your workflow, with connection evidence you can inspect.

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18175 servers

Ordered by checks passedClear filters
Dated server measurements. The status describes the last probe or a listed authentication requirement. Checks that have not been measured are not failures. Open a server to inspect the evidence.
Server / capabilityLast probeMedian latencyChecks passedLast checked
LabelQueue — Avery Label Dimensions, Margin & Bleed Layout Engine

Look up exact Avery & standard sheet label dimensions, pitch, margins & print layout specs.

Developer ToolsData access / search

Responded84 ms15 / 22
Zero Slop

Score and rewrite AI-assisted prose while preserving names, numbers, quotes, links, and facts.

Developer ToolsCode & DevOps

Responded85 ms15 / 22
Library of Alexandria

Classic books in 25 languages: search, print editions, the free shelf. Read-only, no sign-in.

Developer ToolsCode & DevOps

Responded85 ms15 / 22
Books Like This

Books like one you enjoyed, a book's details and any film of it, and an author's books.

Developer ToolsCode & DevOps

Responded86 ms15 / 22
Cheapest Price

The lowest current price for a product, checked live, with the typical price and links to compare.

Developer ToolsCode & DevOps

Responded87 ms15 / 22
Bible Swipe

A Bible reading a day, line by line, any passage by reference, and search.

Developer ToolsCode & DevOps

Responded87 ms15 / 22
Havoptic AI Release Intelligence

Release intelligence for AI coding tools: releases, typed changes, breaking changes, cadence.

Developer ToolsCode & DevOps

Responded87 ms15 / 22
Grandet

Cheapest API for any model across official, inference and relay providers; find free credits

Developer ToolsCode & DevOps

Responded88 ms15 / 22
AI application security research and assessments

Read AI security guides and lab research, and request an LLM or AI agent security assessment.

Developer ToolsAI / LLM tooling

Responded88 ms15 / 22
Shared Forest

Plant or sponsor trees in a shared forest that grows from its traffic. Sponsoring uses OAuth.

Developer ToolsCode & DevOps

Responded89 ms15 / 22
Archestack

Search, rank and compare open-source AI projects with Archestack's open data

Developer ToolsCode & DevOps

Responded89 ms15 / 22
Perfboard Designer

Design perfboard and stripboard layouts, check the wiring and get a link to open them in the editor.

Developer ToolsCode & DevOps

Responded89 ms15 / 22
Restaurant Health Inspections

Restaurant health inspection grades and violations for 20 US, UK, Canadian and French locations.

Developer ToolsCode & DevOps

Responded90 ms15 / 22
Frontier Signal

Query verified AI data-broker buyer programmes and demand signals.

Developer ToolsCode & DevOps

Responded91 ms15 / 22
River Level MCP

Live US river levels, streamflow and NWS flood forecasts from USGS stream gauges.

Developer ToolsCode & DevOps

Responded92 ms15 / 22
Nonobench

An open-source benchmark of how well LLMs solve nonogram puzzles, from 5x5 to 20x20.

Developer ToolsCode & DevOps

Responded92 ms15 / 22
Signal Desk paid tools

x402-paid tools: render pages, host files, delayed callbacks, pump.fun launch feed, trend radar

Developer ToolsCode & DevOps

Responded92 ms15 / 22
jotview

Turn markdown and Mermaid diagrams into rendered jotbins.com links, and read them back.

Developer ToolsFile & docs

Responded92 ms15 / 22
Guild Wars 1 Build Compiler

GW1 build compiler: skill data, template code encode/decode, validation, hero roster. Read-only.

Developer ToolsCode & DevOps

Responded93 ms15 / 22
The Roofing List

Find checked US roofers, siding and gutter contractors by city. Read-only, no login.

Developer ToolsCode & DevOps

Responded94 ms15 / 22
IPO Radar — Indian IPO GMP

Live Indian IPO GMP, subscription status, upcoming IPOs and GMP-vs-listing accuracy.

Developer ToolsPayments & trading

Responded95 ms15 / 22
OPC UA Modeler

OPC UA companion spec types, namespace dependencies, and engineering units for AI agents

Developer ToolsCode & DevOps

Responded96 ms15 / 22
Rising Shores Singapore

Sea-level rise in Singapore: when a place or address floods, areas and people affected, IPCC AR6.

Developer ToolsCode & DevOps

Responded96 ms15 / 22
Formquote

Published prices and licence fit for email verification, sound effect packs and font licences.

Developer ToolsCommunication & messaging

Responded96 ms15 / 22

Automated measurements. Not a rating. Unmeasured checks are not failures. How to read the evidence